UC-NRLF 


/i^4- 


$B    7M    Dflb 


iii 


No.  1986 


DIRECTIONS  FOR  USING,  MOUNTING 
AND  DISMOUNTING 

I-PDR.  AND  2.95-INCH  SUBCALIBER  GUNS 

IN  THE  BORE  OF  SEACOAST  GUNS  AND  MORTARS 


(7  PLATES) 
AND  INSTRUCTIONS  FOR  USING  THE 

RELOADING  AND  RESIZING  OUTFIT 
FOR  DRILL  PRIMERS 


{2  PLATES) 


w  R  A  P 


JANUARY  18,  1904 
REVISED  JANUARY  10,  1907 
REVISED  APRIL  14,  1910 
REVISED  AUGUST  8,  1914 


WASHINGTON 
GOVERNMENT  PRINTING  OFFICE 

J9i7 


1 


Ing  from 
)ration 


No.  1986 


DIRECTIONS  FOR  USING,  MOUNTING 
AND  DISMOUNTING 

I-PDR.  AND  2.95-INCH  SUBCALIBER  GUNS 

IN  THE  BORE  OF  SEACOAST  GUNS  AND  MORTARS 


(7  PLATES) 


AND  INSTRUCTIONS  FOR  USING  THE 

RELOADING  AND  RESIZING  OUTFIT 
FOR  DRILL  PRIMERS 


{2  PLATES) 


JANUARY  18,  1904 
REVISED  JANUARY  10,  1907 
REVISED  APRIL  14,  1910 
REVISED  AUGUST  8,  1914 


WASHINGTON 

GOVERNMENT  PRINTING  OFFICE 

1917 


\j\ 


cs<^^ 


^2 


A^ 


/•  9    .»!•  ») 


Wab  Depabtment, 
Office  of  the  Chief  of  Obdnance, 

Washington,  August  8,  191//. 
This  Manual  is  published  for  the  information  and  government  of  the  Regular 
Army  and  Organized  Militia  of  the  United  States. 
By  order  of  the  Secretary  of  War: 

William  Cbozieb, 
Brigadier  General,  Chief  of  Ordnance. 
(3) 


3G3i76 


DIRECTIONS 


MOUKTING  AiND  DISMOUiNTLNG  1-POUKDER  SUBCALIBEH  GUNS 
IN  THE  BORE  OF  SEACOAST  GUNS. 


6-INCH  GUNS,  MODELS  OF  1900  AND  1903,  AND  10  AND  12  INCH 
GUNS,  MODEL  OF  1900. 


DIRECTIONS   FOR   ASSEMBLING. 

Chamber  and  bore  of  subcaliber  gun  and  of  large  gun  must  be 
perfectly  clean. 

Remove  blank  plugs  from  mushroom  head  and  put  on  obturator 
spindle  plate  with  its  two  screws,  tighten  the  screw  heads  up  on  the 
plate,  using  the  securing  screw  wrench  for  the  purpose. 

Insert  loading  tray,  where  provided,  to  prevent  bruising  the 
adapters  on  the  breech  threads. 

See  that  rear  adapter  wedge  is  all  the  way  forward,  and  insert 
subcaliber  gun,  w4th  adapters  (wedge  uppermost),  into  chamber  of 
large  gun,  pushing  it  smartly  forward  with  the  handspike  to  cause 
the  front  adapter  to  seat  firmly  in  slope  of  chamber. 

Supporting  subcaliber  gun  with  handspike,  slip  the  bronze  shoe 
under  rear  adapter. 

Having  made  sure  that  subcaliber  gun  is 'as  far  forward  as  it  can 
go,  remove  handspike.  Slip  locating  gauge  over  obturator  spindle 
plate,  leaving  a  space  between  gauge  and  spindle  plate.  Close  breech 
gently.  If  resistance  is  encountered,  the  gun  is  too  far  to  the  rear. 
Open  the  breech  and  turn  gun  right  handed.  If  no  resistance  is 
encountered  in  closing,  open  breech  and  note  whether  gauge  has 
been  pushed  back  against  spindle.  If  it  has  not  been  pushed  all  the 
way  back,  turn  the  gun  left  handed  one  turn  for  each  0.1  inch.  Con- 
tinue to  try  in  this  manner  until  the  gauge  is  pushed  just  against 
the  spindle  plate  when  closing  the  gun. 

Having  adjusted  subcaliber  gun  until  the  locating  gauge  is  pushed 
exactly  against  spindle  plate  by  closing  breech,  tighten  the  wedge 
screw  with  clamping  screw  driver,  setting  the  wedge  firmly  back 
against  rear  slope  of  chamber  to  prevent  subcaliber  gun  from  turn- 
ing.    The  gun  is  then  ready  for  firing. 

(5) 


lUlUXTi.ON^    FOR    DIS.MOCNTING. 

Insert  io.nding  tniy,  if  on<i  is  provided. 

Ease  up  wedge  screw  and  run  wedge  all  the  way  forward,  insert 
handspike,  lift  on  same  to  support  the  weight,  remove  adapter  shoe, 
jind  pull  the  subcaliber  gun  to  the  rear  and  out. 

This  order  must  always  be  followed,  for  if  the  shoe  is  removed  be- 
fore the  subcaliber  gun  is  loosened,  letting  down  the  breech  of  the 
subcaliber  gun  will  cause  the  front  adapter  to  bind  in  its  seat  and 
there  will  be  considerable  difficulty  in  removing  the  subcaliber  gun. 

If  the  subcaliber  gun  sticks  in  the  bore  of  the  large  gun,  insert  the 
gun  extractor  rod  into  and  through  the  bore  of  the  subcaliber  gun 
until  the  foot  on  the  front  end  of  the  rod  can  be  caught  against  the 
muzzle  face  of  the  subcaliber  gun.  Then  slip  the  gun-extractor  rod 
strap  over  the  rear  end  of  the  rod  until  it  comes  up  against  the  breech 
face  of  the  larger  gun.  Apply  the  nut  and  screw  up  on  the  nut  until 
the  subcaliber  gun  is  loosened,  after  which  remove  the  gun-extractor 
rod.  and  proceed  to  remove  the  subcaliber  gun  as  if  it  had  not  stuck. 


1-POUNDER  SUBCALIBER  GUN  FOR  5-INCH  GUN,  MODEL  OF  1900. 


DIRECTIONS  FOR  ASSEMBLING. 

Chamber  and  bore  of  subcaliber  gun  and  of  large  gun  must  be 
perfectly  clean. 

Eemove  blank  plugs  from  mushroom  head  and  put  on  obturator 
spindle  plate  with  its  two  screws;  tighten  the  screw  heads  upon  the 
plate. 

Insert  subcaliber  gun,  with  its  adapters,  into  chamber  of  large 
gun,  being  careful  to  see  that  the  outer  circumference  of  the  outer 
ring  of  rear  adapter  is  concentric  with  subcaliber  gun,  and  push  it 
forward  with  the  handspike  until  the  center  support  is  seated  firmly 
in  slope  of  chamber.  Also  see  that  the  rear  face  of  the  rear  adapter 
is  in  contact  with  the  front  face  of  the  breech  hoop  on  the  subcaliber 
gun.     This  will  -facilitate  the  handling  of  the  shoe. 

Supporting  breech  of  subcaliber  gun  with  handspike,  turn  outer 
ring  of  rear  adapter  by  pushing  on  lug  provided  for  that  purpose 
with  dismounting  pin  as  far  to  the  left  as  the  stops  will  permit.  The 
rear  adapter  at  this  time  is  abutting  against  the  set  screw  in  body  of 
subcaliber  gun. 

Screw  gun,  further  forward  until  shoe  can  be  inserted  loosely. 
This  is  necessary  because  shoe  is  too  large  to  pass  between  cylindrical 
part  of  breech  hoop  and  choke  of  powder  chamber. 

Now  screw  gun  back  until  about  ^  inch  or  1  inch  in  rear  of  proper 
position.  The  eccentric  and  adapter  will  turn  with  the  gun  because 
not  locked  by  shoe. 

Secure  subcaliber  gun  by  inserting  the  shoe  beneath  the  rear 
adapter. 

Screw  gun  forward  to  its  proper  position  as  indicated  by  the 
locating  gauge.  Nothing  prevents  this,  as  set  screw  is  now  moving 
forward  and  away  from  adapter. 

Having  made  sure  that  subcaliber  gun  is  as  far  forward  as  it  can 
go,  remove  handspike.  Slip  locating  gauge  over  obturator  spindle 
plate,  leaving  a  space  between  gauge  and  spindle  plate.  Close  breech 
gently.  If  resistance  is  encountered,  the  gun  is  too  far  to  the  rear. 
Open  the  breech  and  turn  gun  right  handed.  If  no  resistance  is 
encountered  in  closing,  open  breech  and  note  whether  gauge  has 
been  pushed  back  against  spindle.     If  it  has  not  been  pushed  all  the 

(7) 


8 

WRY  back,  turn  the  gun  left  handed,  1  turn  for  each  0.1  inch.  Con- 
tinue to  try  in  this  manner  until  the  ,gauge  is  pushed  just  against 
the  spindle  plate  when  closing  the  gun.  ^'    / 

Having  adjusted  subcaliber  gun  until  the  locating  gauge  is  pushed 
exactly  against  spindle  plate  by  closing  breech,  tighten  screw  of  rear 
adapter  shoe  with  screw  driver,  thus  tightening  the  adapter  and  pre- 
vent the  gun  from  moving  forward. 

The  gun  is  then  ready  for  firing. 

DIRECTIONS  FOR  DISMOUNTING. 

Ease  up  adapter  shoe  screw,  insert  handspike,  lift  on  same  to  sup- 
port weight,  and  remove  adapter  shoe. 

Using  the  dismounting  pin,  turn  outer  ring  of  rear  adapter  to  the 
right  until  it  stops,  then  pull  gun  to  the  rear  and  out. 

A  small  set  screw  is  let  into  the  body  of  the  subcaliber  gun  just 
forward  of  the  rear  adapter.  This  set  screw  must  be  removed  when 
it  becomes  necessary  to  remove  the  rear  adapter,  but  must  be  re- 
placed when  rear  adapter  is  put  back  on  the  gun. 

The  dismounting  pin  is  provided  in  case  of  necessity  for  removing 
adapters. 

If  the  subcaliber  gun  sticks  in  the  bore  of  the  large  gun,  insert  the 
gun  extractor  rod  into  and  through  the  bore  of  the  subcaliber  gun, 
until  the  foot  on  the  front  end  of  the  rod  can  be  caught  again^  the 
muzzle  face  of  the  subcaliber  gun;  then  slip  the  gun  extractor-rod 
strap  over  the  rear  end  of  the  rod,  until  it  comes  up  against  the 
breech  face  of  the  larger  gun.  Apply  the  nut  and  screw  up  on  it 
until  the  subcaliber  gun  is  loosened,  after  which  remove  the  gun 
extractor  rod  and  proceed  to  remove  the  subcaliber  gun  as  if  it  had 
not  stuck. 


4-INCH   DRIGGS-SCHROEDER  AND   4.72-INCH   AND   6-INCH   ARM- 
STRONG GUNS. 


DIRECTIONS  FOR  ASSEMBLING. 

Chamber  and  bore  of  subcaliber  gun  and  of  large  gun  must  be 
perfectly  clean. 

Insert  subcaliber  gun,  with  supports,  into  bore  of  large  gun,  push- 
ing it  completely  forward  with  the  handspike  to  cause  the  flange  of 
rear  adapter  to  seat  firmly  against  the  tube  of  large  gun. 

Tighten  expanding  screw  in  rear  adapter  to  clamp  the  adapter 
sleeve  against'  wall  of  chamber,  using  the  clamping  screw  driver. 
The  gun  is  then  ready  for  firing. 

DIRECTIONS  FOR  DISMOUNTING. 

Ease  up  expanding  screw,  insert  handspike,  lift  on  same  to  sup- 
port the  weight,  and  pull  the  subcaliber  gun  to  the  rear  and  out. 

The  dismounting  pin  is  provided  in  case  of  any  necessity  for  remov- 
ing front  adapter  or  supports. 

If  the  subcaliber  gun  sticks  in  the  bore  of  the  large  gun,  insert  the 
gun-extractor  rod  into  and  through  the  bore  of  the  subcaliber  gun 
imtil  the  foot  on  the  front  end  of  the  rod  can  be  caught  against  the 
muzzle  face  of  the  subcaliber  gun.  Then  slip  the  gun-extractor  rod 
strap  over  the  rear  end  of  the  rod  until  it  comes  up  against  the  breech 
face  of  the  larger  gun.  Apply  the  nut  and  screw  up  on  the  nut  until 
the  subcaliber  gun  is  loosened,  after  which  remove  the  gun-extractor 
rod  and  proceed  to  remove  the  subcaliber  gun  as  if  it  had  not  stuck. 

103939—17 2  (9) 


5  AND  6  INCH  GUNS,  MODEL  OF  1897,  AND  6-INCH  GUNS,  MODELS 
OF  1905,  1908,  1908  Mi,  AND  1908  Mii. 


DIRECTIONS   FOR  ASSEMBLING. 

Chamber  and  bore  of  siibcaliber  gun  and  of  large  gun  must  be 
perfectly  clean. 

Put  on  obturator  spindle  plate  with  its  two  screws,  using  the  screw- 
driver for  the  purpose,  and  tighten  the  screw  heads  upon  the  plate. 

Insert  subcaliber  gun,  with  adapters,  into  chamber  of  large  gun, 
pushing  it  smartly  forward  with  the  handspike  to  cause  the  front 
adapted  to  seat  firmly  in  slope  of  chamber. 

Having  made  sure  that  subcaliber  gim  is  as  far  forward  as  it  can 
go,  remove  handspike.  Slip  locating  gauge  over  obturator  spindle 
plate,  leaving  a  space  between  gauge  and  spindle  plate.  Close  breech 
gently.  If  resistance  is  encountered,  the  gun  is  too  far  to  the  rear. 
Open  the  breech  and  turn  gun  right  handed.  If  no  resistance  is 
encountered  in  closing,  open  breech  and  note  whether  gauge  has 
been  pushed  back  against  spindle.  If  it  has  not  been  pushed  all  the 
way  back,  turn  the  gun  left  handed  one  turn  for  each  0.1  inch. 

Continue  to  try  in  this  manner  until  the  gauge  is  pushed  just 
against  the  spindle  plate  when  closing  the  gun. 

Having  adjusted  subcaliber  gun  until  the  locating  gauge  is  pushed 
exactly  against  spindle  plate  by  closing  breech,  tighten  expanding 
or  clamp  screw  with  clamping  screw  driver.  After  this  tighten  the 
thread  clamp  screw  to  prevent  the  gun  from  turning.  The  gun  is 
then  ready  for  firing. 

DIRECTIONS   FOR   DISMOUNTING. 

Ease  up  expanding  or  clamp  screw,  insert  handspike,  lift  on  same 
to  support  the  weight,  and  pull  the  subcaliber  gun  to  the  rear  and 
out. 

The  dismounting  pin  is  provided  in  case  of  any  necessity  for 
removing  front  adapter  or  muzzle  support. 

If  the  subcaliber  gun  sticks  in  the  bore  of  the  large  gun,  insert  the 
gun-extractor  rod  into  and  through  the  bore  of  the  subcaliber  gun 
until  the  foot  on  the  front  end  of  the  rod  can  be  caught  against  the 
muzzle  face  of  the  subcaliber  gun;  then  slip  the  gun-extractor  rod 
strap  over  the  rear  end  of  the  rod  until  it  comes  up  against  the  breech 
face  of  the  larger  gun.  Apply  the  nut  and  screw  up  on  the  nut  until 
the  subcaliber  gun  is  loosened,  after  which  remove  the  gun-extractor 
rod  and  proceed  to  remove  the  subcaliber  gun  as  if  it  had  not  stuck. 

(11) 


8-INCH  GUNS,  MODEL  OF  1888,  10  AND  12  INCH  GUNS,  MODELS  OF 
1888  AND  1895,  AND  14-INCH  GUNS,  ALL  MODELS. 


DIRECTIONS    FOR    ASSEMBLING. 

Chamber  and  bore  of  snbcaliber  gun  and  of  large  gun  must  be 
perfectly  clean. 

Remove  blank  pressure  plugs  from  mushroom  head  and  put  on 
olitiirator  spindle  plate  with  its  two  screws,  using  the  tit  wrench. 
Tighten  the  screw  heads  upon  the  plate. 

Insert  the  loading  tray,  if  one  is  provided,  t6  prevent  bruising  the 
adapters  on  the  breech  threads. 

Insert  subcaliber  gun,  with  adapters,  into  the  chamber  of  large 
gun,  pushing  it  smartly  forward  with  the  handspike,  to  cause  the 
front  adapter  to  seat  firmly  in  slope  of  chamber,  which  it  is  tapered 
to  fit. 

Tighten  clamp-wedge  screws  in  rear  adapter  to  cause  clamp  wedge 
to  expand  the  adapter  against  walls  of  chamber,  using  the  clamping 
wrench. 

Having  made  sure  that  subcaliber  gun  is  as  far  forward  as  it  can 
go,  remove  handspike.  Slip  locating  gauge  over  obturator  spindle 
plate,  leaving  a  space  between  gauge  and  spindle  plate.  Close  breech 
gently.  If  resistance  is  encountered,  the  gun  is  too  far  to  the  rear. 
Open  the  breech  and  turn  gun  right  handed.  If  no  resistance  is 
encountered  in  closing,  open  breech  and  note  whether  gauge  has 
been  pushed  back  against  spindle.  If  it  has  not  been  pushed  all  the 
way  back,  turn  the  gun  left  handed  one  turn  for  each  0.1  inch.  Con- 
tinue to  try  in  this  manner  until  the  gauge  is  pushed  just  against 
the  spindle  plate  when  closing  the  gun. 

Having  adjusted  subcaliber  gun  until  the  locating  gauge  is  pushed 
exactly  against  the  spindle  plate  by  closing  breech,  tighten  the  thread 
clamp  screw  with  the  clamping  wrench  to  prevent  gun  from  turning. 
Tlie  gun  is  then  ready  for  firing. 

DIRECTIONS  FOR  DISMOUNTING. 

Insert  loading  tray,  if  one  is  provided. 

Ease  up  both  clamp  screws,  insert  handspike,  lift  on  same  to 
support  the  w^eight,  and  pull  the  subcaliber  gun  to  the  rear  and  out. 

(13) 


14 

If  the  subcaliber  gun  sticks  in  the  bore  of  the  large  gun,  insert 
the  gun  extractor  rod  into  and  through  the  bore  of  the  subcaliber 
gun  until  the  foot  on  the  front  end  of  the  rod  can  be  caught  against 
the  muzzle  face  of  the  subcaliber  gun;  then  slip  the  gun-extractor 
rod  strap  over  the  rear  end  of  the  rod  until  it  comes  up  against  the 
breech  face  of  the  larger  gun.  Apply  the  nut  and  screw  up  on  the 
nut  until  the  subcaliber  gun  is  loosened,  after  which  remove  the  gun- 
extractor  rod  and  proceed  to  remove  the  subcaliber  gun  as  if  it  had 
not  stuck. 

GENERAL  DIRECTIONS  FOR  USE,   CARE,   AND   HANDLING   OF  ALL    1-POUNDER 

SUBCALIBER  GUNS. 

Insert  cartridge,  close  the  breech,  and  fire  as  with  regular  ammuni- 
tion, removing  the  empty  cartridge  case  after  each  round  with  the 
hand  extractor.  ^ 

If  the  case  sticks  and  can  not  be  removed  with  the  limit  of  extrac- 
tion given  by  the  hand  extractor,  use  the  clip  extractor,  which  is 
provided  for  such  an  emergency.  A  light  rope  may  be  passed  through 
the  eye  of  this  extractor,  and  force  exerted  by  a  lever  against  the 
face  of  the  breech,  if  necessary. 

It  is  best  to  try  locating  gauge  after  one  or  two  rounds,  to  be 
sure  the  gun  has  not  moved  forward,  and  this  should  be  repeated 
frequently. 

Any  fouling  of  vent  in  mushroom  must  be  removed  with  vent 
cleaner. 

Care  should  be  taken,  in  assembling  and  dismounting,  and  at  all 
times,  to  prevent  the  turned  surfaces  of  adapters  from  coming  in 
contact  with  any  hard  substance.  If  a  burr  should  appear,  it  must 
be  smoothly  filed  down  before  assembling. 

Particular  care  must  be  taken,  in  loading,  not  to  drive  the  point 
of  the  shell  against  the  edge  of  the  chamber  of  subcaliber  gun. 

The  clamp  screws  and  adapter  hubs  should  always  be  kept  well 
oiled.     An  oil  can  is  provided  for  this  purpose. 

After  firing,  the  gun  should  be  washed  out  and  the  bore  lubricated 
with  light  slushing  oil. 

During  firing,  when  necessary,  the  gun  should  be  w\ashed  out  and 
cleaned  with  oil. 

The  chamber  and  bore  of  small  gun  should  be  lightly  oiled  when 
put  away.  The  cleaning  sponge  is  removable  from  its  rod,  and 
should  be  thoroughly  cleaned  and  dried  after  use. 

Two  forms  of  locating  gauges  have  been  provided,  one  of  which  is 
fitted  in  the  chamber  of  the  1-pounder  subcaliber  gun  and  the  other 
is  fitted  to  the  edge  of  the  spindle  plate  on  the  front  face  of  the 
obturator. 


15 


STATEMENT    AS    TO    INTERCHANGEABILITY    OF    1-POUNDEE    SUBCALIBER    GUNS. 


1-pounder  subcallber  guns  adapted  for — 

When  fitted  with  the  proper  adapters  can 
also  be  used  in — 

4-iuch  Driggs-Schroeder  gun. 

6-inch,  1905. 

8,  10,  12,  £\nd  14  inch  guns,  all  models. 

4.72-inch  Armstrong  gun. 

6-inch,  1905. 

8,  10,  12,  and  14  inch  guns,  all  models. 

5-inch  gun,  model  of  1897. 

6-inch,  1905. 

8,  10,  12,  and  14  inch  guns,  all  models. 

5-inch  gun,  model  of  1900. 

6-inch,  1905. 

8,  10,  12,  and  14  inch  guns,  all  models. 

6-inch  guns,  models  of  1897  and  1908. 

10,  12,  and  14  inch  guns,  all  models. 

6-inch  guns,  models  of  1900  and  1903. 

6-inch,  1905. 

8,  10,  12,  and  14  inch  guns,  all  models. 

6-inch  guns,  model  of  1905. 

6-inch,  1900  and  1903. 

8,  10,  12,  and  14  inch  guns,  all  models. 

8,  10,  12,  and  14  inch  guns,  all  models. 

6-inch  models  of  1900,  1903,  and  1905. 

Chests  for  1-Pounder  Subcaliber  Guns  and  Adapters. 

Two  models  of  storage  chests  are  now  being  manufactured.  These 
are  storage  chest  "  B,"  which  contains  the  1-pounder  subcaliber  gun, 
together  with  certain  tools  which  are  common  to  various  seacoast 
guns,  and  storage  chest  "  C,"  which  contains  those  articles  which 
are  different  for  every  ixiodel  and,  caliber  of  seacoast  gun,  such  as 
adapters  and  certain  tools. 

Two  types  of  storage  chest  "  B  "  are  made.  One  of  these  is  for 
tools  and  subcaliber  guns  for  4-inch  Driggs-Schroeder,  4.72-inch 
Armstrong,  or  6-inch  Armstrong  guns.  The  other  is  for  tools  and 
subcaliber  guns  for  all  other  seacoast  guns. 


AMMUNITION. 


The  amnuinition  issued  for  these  guns  consists  of  a  steel  shell  with 
blank  point  fuze  plug,  weight  7,5Q0i!=150  grains,  fixed  to  a  cartridge 
case,  the  total  weight  of  a  complete  round  being  about  1.585  pounds. 
The  use  of  the  point  percussion  fuze,  designed  for  1-pounder  ammu- 
nition, has  been  discontinued.  The  ammunition  is  issued  packed  in 
wooden  boxes,  50  rounds  to  the  box.  The  primer  used  in  the  base 
of  the  cartridge  case  is  either  an  igniting  primer  or  a  percussion 
primer,  depending  upon  the  gun  in  which  the  subcaliber  gun  is  used. 
Subcaliber  guns  mounted  in  4-inch  Driggs-Schroeder  and  4.72  and  6 
inch  Armstrong  guns  require  percussion-primed  ammunition.  All 
other  guns  require  igniting-primed  ammunition. 


DIRECTIONS 

FOB 


USING,  MOUNTING,  AND  DISMOUNTING  2.9HNCH  SUBCALIBER 
GUNS  IN  THE  BORE  OF  12-INCH  MORTARS,  ALL  MODELS. 


DIRECTIONS  FOR  ASSEMBLING. 

Chamber  and  bore  of  subcaliber  gun  and  of  mortar  must  be  per- 
fectly clean. 

Remove  blank  pres§ur,e  plugs  from  mushroom  head  and  put  on 
obturator  spindle  plate  with  its  two  screws,  using  the  securing-screw 
wrench.    Tighten  the  screw  heads  upon  the  plate. 

Insert  the  loading  tray  to  prevent  bruising  the  adapters  on  the 
breech  threads. 

Insert  subcaliber  gun,  with  adapters,  into  the  chamber  of  the  mor- 
tar, pushing  it  smartly  forward  with  the  handspike  to  cause  the 
front  adapter  to  seat  firmly  in  slope  of  chamber,  which  it  is  tapered 
to  fit. 

Tighten  clamp-wedge  screw  in  rear  adapter  to  cause  the  adapter 
clamp  wedge  to  expand  the  adapter  against  walls  of  chamber,  using: 
the  clamping  wrench. 

Having  made  sure  that  subcaliber  gun  is  as  far  forward  as  it  can 
go,  remove  handspike.  Slip  locating  gauge  over  obturator  spindle 
plate,  leaving  a  space  between  guage  and  spindle  plate.  Close  breech, 
gontly.  If  resistance  is  encountered,  the  gun  is  too  far  to  the  rear. 
Open  the  breech  and  turn  gun  right-handed.  If  no  resistance  is  en- 
countered in  closing,  open  breech  and  note  whether  gauge  has  been 
pushed  back  against  spindle.  If  it  has  not  been  pushed  all  the  way 
back,  turn  the  gun  left-handed  one  turn  for  each  0.1  inch. 

Continue  to  try  in  this  manner  until  the  gauge  is  pushed  just 
against  the  spindle  plate  when  closing  the  gun. 

Having  adjusted  subcaliber  gun  until  the  locating  gauge  is  pushed! 
exactly  against  spindle  plate  by  closing  breech,  tighten  the  thread! 
clamp  screw  with  clamping  wrench  to  prevent  the  subcaliber  gun 
from  turning.    The  gun  is  then  ready  for  firing. 
103939—17 ^3  (17) 


18 

DIRECTIONS  FOR  USE. 

Insert  cartridge,  close  the  breech,  and  fire  as  with  regular  aninm- 
nition,  removing  the  empty  cartridge  case  after  each  round  with  the 
hand  extractor. 

If  the  case  sticks  when  the  limit  of  extraction  given  by  the  hand 
extractor  is  reached,  use  the  clip  extractor  which  is  provided  for  such 
emergency.  A  light  rope  may  be  passed  through  the  eye  of  this 
extractor  and  force  exerted  by  a  lever  against  the  face  of  the  lu'oecli, 
if  necessary. 

It  is  best  to  try  locating  gauge  after  one  or  two  rounds,  to  be  sure 
gun  has  not  moved  forward. 

Am^  foulipg  of  vent  in  mushroom  must  be  removed  with  vent 
cleaner^ 

DIRECTIONS  FOR  DISMOUNTING. 

Insert  loading  tray,  if  one  is  provided. 

Ease  up  both  clamp  screws,  insert  handspike,  lift  on  same  to 
support  the  weight,  and  pull  the  subcaliber  gun  to  the  rear  and  out ; 
if  not  easily  withdrawn,  use  gun  extractor. 

CARE  AND  HANDLING. 

Care  should  be  taken  in  assembling  and  dismounting,  and  at  all 
times,  to  prevent  the  turned  surfaces  of  adapters  from  coming  in 
contact  with  any  hard  substance.  If  a  burr  should  appear  it  must 
be  smoothly  filed  down  before  assembling. 

Particular  care  must  be  taken  in  loading  not  to  drive  the  point 
of  the  shell  against  the  edge  of  the  chamber  of  the  subcaliber  gun. 

The  clamp  screws  and  adapter  hubs  should  always  be  kept  well 
oiled.    An  oil  call  is  provided  for  this  purpose. 

After  firing,  the  bore  of  the  subcaliber  gun  should  be  thoroughly 
sponged  with  warm  soapsuds  and  be  perfectly  dry  before  the  gun 
IS  returned  to  its  chest.  The  chamber  and  bore  of  the  gun  should  be 
lightly  oiled  when  put  away.  The  cleaning  sponge  is  removable 
from  its  rod,  and  should  be  thoroughly  cleaned  and  dried  after  use. 

Two  types  of  2.95-inch  subcaliber  gun  are  in  service.  The  first 
type  is  intended  for  the  12-inch  mortar,  model  of  1886.  This  can  also 
be  used  in  the  12-inch  mortar,  modelof  1886-90Mi,  1890, 1890Mi,  and 
1908,  when  fitted  with  the 'proper  adapters. 

The  second  type,  which  is  the  only  one  now  being  made,  is  in- 
tended for  use  in  the  12-inch  mortar,  model  1886-90Mi,  1890,  1890Mi, 
and  1908.  Special  adapters  are  made  to  fit  this  to  the  12-inch  mortar, 
model  of  1912,  and  to  the  12-inch  mortar,  model  of  1886. 


INSTRUCTIONS 

FOB 


LlS[iNG  THE  RESTZINCx  AJsD  RELOADTSG  OUTFIT  FOR  DRILL 
PRIMERS  IN  ASSEMBLIJSG,  DISASSEMBLING,  CLEANING,  RE- 
SIZING, AND  RELOADING  THE  DRILL  PRIMER. 

(Two  plates.) 


IMPORTANT  NOTE.  _ 

The  post  ordnance  officer  of  each  coast  artillery  post  should  have  supervision 
of  the  disassembling,  cleaning,  resizing,  assembling,  and  reloading  of  drill 
primers,  and  should  issue  them  to  the  companies  as  required.  He  should 
thoroughly  familiarize  hiiuself  with  the  contents  of  this  pamphlet  and  see  that 
ihe  men  assigned  to  the  work  of  reloading  do  it  exactly  as  prescribed  within. 
He  should  impress  upon  these,  men  the  importance  of  following  the  instructions. 
The  failure  to  do  so  has  given  much  difficulty  in  the  past. 

The  resizing  and  reloading  outfit  for  drill  primer  consists  of  the 
following  parts: 

1  chest. 

3  assembling  tools. 

3  disassembling  tools. 

27  disassesmbling  tool  pins. 

3  reamers. 

3  funnels.  ' 

3  chargers. 

1  push  pin. 

1  resizing  die. 

1  bushing. 

1  maximum  gauge  for  length  of  wire  under  button. 

2  cleaning  taps  for  button  wire. 
1  instruction  pamphlet. 

1  small  primer-inserting  press. 

With  the  exception  of  the  small^  primer-inserting  press,  the  outfit 
is  shown  on  Plate  II. 

THE  DRILL  PRIMER. 

Plate  I. 

The  drill  primer  is  used  for  friction  firing  in  seacoast  guns,  5  to  12 
inch,.incl\isive,  for  firing  salutes,  night  practice,  subcaliber  firings, 

(19) 


20 

etc.,  to  avoid  the  expense  of  using  the  service  combination  electric 
and  friction  primer  for  such  purposes. 

The  components  of  the  drill  primer  (Plate  I)  are  issued  in  bulk 
upon  requisition.     The  components  are : 

The  body. 

The  button  wire. 

The  serrated  wire  with  friction  pellet. 

The  end-closing  cup.* 

The  charge  (25  grains  of  loose  rifle  powder). 
A  complete  description  of  this  primer  will  be  found  in  Ordnance 
Pamphlet  Form  No.  1881. 

TO  ASSEMBLE  AND  LOAD  THE  PRIMERS. 

The  primers  will  be  assembled  not  more  than  a  few  days  before 
they  are  to  be  fired.  To  assemble  the  primer  insert  the  serrated  \Yire 
with  friction  pellet  in  its  seat  in  the  body,  care  being  taken  that  the 
seat  in  the  body  for  the  friction  pellet  is  clean  and  free  from  obstruc- 
tion. With  the  left  hand  insert  the  assembling  tool,  slotted  end  fore- 
most, and  turn,  without  pressure,  until  the  assembling  tool  slips  over 
the  serrated  wire.  With  the  thumb  and  first  finger  of  the  right  hand 
screw  a  button  wire  on  the  threaded  rear  end  of  the  serrated  wire. 
The  maximum  gauge  for  length  of  wire  under  button  should  be  used 
to  determine  the  required  distance  from  the  button  to  the  body  of 
the  drill  primer. 

Do  not  screw  the  button  wire  on  too  hard.  If  found  tight ^  unscrew 
the  button  wire  and  clean  the  threads  with  the  cleaning  tap  for  hut- 
ton  wire.  If  the  forward  end  of  the  serrated  wire  should  he  tioisted 
off  by  too  hard  turning.,  the  body.,  serrated  wire.,  and  button  wire  are 
all  worthless  and  must  be  thrown  away,  because  the  primer  can  not 
he  disassembled. 

Pliers  must  not  be  used  in  assembling.  Their  use  should  not  be 
necessary  in  this  operation  and  may  result  in  deformation  of  the 
threaded  parts,  disintegration  of  the  friction  pellet,  or  twisting  off 
of  the  serrated  wire. 

Still  holding  the  primer  in  the  left  hand,  place  the  funnel  on  the 
mouth,  and  with  the  charger  fill  the  primer  with  25  grains  of  loose 
rifle  powder.  With  the  right  hand  holding  the  assembling  tool, 
moisten  the  linslotted  end,  insert  it  in  the  end-closing  cup,  and  force 
the  end-closing  cup  into  the  mouth  of  the  body.  The  primer  is  then 
ready  for  firing.  Should  assembled  pi^mers  be  returned  without 
being  fired,  they  will  be  kept  free  from  moisture  until  used. 

TO    DISASSEMBLE    AND    CLEAN    THE    PRIMERS. 

Immediately  after  the  firing  for  the  day  has  ceased,  the .  fired 
drill  primers  should  be  turned  over  to  the  post  ordnance  officer,  who 


21 

will  take  steps  to  have  them  disassembled  and  cleaned  at  once. 
After  disassembling  thfe  serrated  wire  and  button  wire  with  the  aid 
of  the  assembling  tool  and  forcing  out  the  serrated  wire  with  the 
disassembling  tool  the  bodies  and  button  wires  will  be  plunged  into 
a  hot  solution  of  soda  for  about  fifteen  minutes,  when  the  residue 
can  be  wiped  off.  The  reamer  will  then  be  used  to  clean  residue, 
from  the  seats  in  the  body  for  the  friction  pellet  and  obturating 
cone  on  the  serrated  wire.  Too  much  importance  can  not  be  at- 
tached to  the  necessity  of  removing  all  traces  of  the  powder  residue, 
as  the  residue  from  black  powder  quickly  attacks  the  metal  of  the 
primer.  Do  not  postpone  disassembling  the  primer  and  cleaning 
the  bodies  and  button  wires  until  a  later  day,  as  it  is  only  by  prompt 
and  thorough  cleaning  that  the  bodies  can  be  kept  in  a  serviceable 
condition. 

TO  RESIZE  THE  BODY. 

Place  the  bushing  in  its  seat  in  the  primer-inserting  press.  After 
inserting  the  body  in  the  resizing  die,  place  the  resizing  die  (with  the 
base  of  the  body  upward)  in  its  seat  in  the  bushing.  Turn  the  lever 
of  the  press  so  as  to  force  the  body  fully  home  in  the  resizing  die. 
Eemove  the  resizing  die  and  insert  the  spindle  of  the  push  pin  in  the 
mouth  of  body  as  far  as  it  will  enter.  Again  place  the  resizing  die 
in  its  seat  in  the  bushing,  with  the  head  of  the  push  pin  upward,  and 
by  turning  the  lever  of  the  press  force  the  body  out  of  the  resizing 
die.    The  body  is  then  in  condition  for  assembling  and  reloading. 

DIRECTIONS  FOR  PULLING  THE  DRILL  PRIMER. 

These  primers  are  adjusted  in  manufacture  to  require  a  pull  of 
about  25  pounds  to  start  the  wire  to  the  rear,  and  about  40  to  45 
pounds  to  pull  the  teeth  on  the  serrated  wire  through  the  com- 
pressed friction  pellet  and  explode  it. 

The  lanyard  should  he  pulled  frorrh  a  position  as  near  the  rear  of 
the  gun  as  possible^  since  pulling  it  from  the  side  will  cause  a  variable 
part  of  the  pull  to  be  absorbed  by  friction  in  the  firing  leaf.  A 
strong,  steady  pull  from  one  man,  with  as  short  a  lanyard  as  possible, 
should  be  used.  When  a  long  lanyard  is  used,  the  slack  causes  the 
force  to  be  applied  to  the  primer  slowly,  and  this  increases  the  chances 
for  a  misfire.  The  quicker  the  pull,  the  better  for  firing  the  primer, 
but  when  a  man  attempts  to  pull  by  a  jerk  he  uses  his  arms  only,  los- 
ing the  assistance  of  his  body,  and  the  strength  of  his  pull  will  be  less. 
If  a  primer  can  not  be  discharged  by  one  man,  it  should  be  rejected 
and  another  used.  By  using  more  than  one  man  on  the  lanyard, 
there  would  be  danger  of  injuring  the  firing  mechanism. 


»  22 

The  primer  is  so  constructed  that  when  a  primer  is  pulled  and  fails 
to  fire,  the  primer  wire  is  free,  and  if  pushed  forward  may  cause  the 
friction  composition  to  ignite.  Such  a  primer  should  at  once  be  dis- 
assembled by  first  taking  out  the  brass  closing  cup  and  powder  and 
then  removing  the  serrated  wire. 

Wak  Depaktment. 

Office  of  the  Chief  of  Ordnance, 

Washington,  August  8,  WVi. 
January  18, 1904. 
Revised  January  10, 1907. 
Revised  April  14, 1910. 
Revised  August  8, 1914. 
FOKM  No.  1986. 
Ed.  June  5-17-2,000. 


PL/ITEL 

/Pdr.  SC/BC/ILfBER  gun 

FOR  ALL  SEACO/iST  GUN^ 
EXCEPT  ^D-3^  AND  ^.72"A/S/D  S'ARMSTROA/G  3C/A/S. 


'0^ )  11       I 


GUN. 


STOflACe  CHEST  '*B' 


CLO^VnNG  SPON^e. 


SPONGE   ROO. 


olZI 


HANDSPIKE.. 


/^Ovli/STINC    WRCMCH. 


HAHiy  £irn?Acrof?. 


VENT  CLCANei?. 


□ 


:> 


OIL  CAN. 


CLIP  eXTRACTOl?. 


3G-/C-2.J 


PL/I  TEH. 


/  Pd/^,  Saa  CAL/BER  GUN. 

ADAPTED   TO  4^  'DS,  AND  ^^Z/iA/D  6  'A/fMST/fOA/Q  Gl/Af\ 


CLEANING  5P0NQE. 


GUKi. 


STORAGE    eH£ST"B" 


2C 


a 


SPONGE.    ROD. 


GUN     t-XTRACTOR, 


ETZbtiz^ 


HANDSPIKE. 


& 


HAND    EXTRACTOR. 


CLIP    EXTRACTOR, 


a 


OIL  CAN. 


iJ6  -/6  -Z4- 


PL/ITEJZL 

/ID/IPT£/?S.  SrO/?A6£:  G//£ST  "C"/im  700L6 

FOK  3.  /O  /lA/D  /S-/N.  6(/A/S,  MODELS  OF /a68  &/89S, 
y^A/D  /^-/M  GUNS  /ILL  MODELS. 


REARAOAPTCA}. 


CENTER   SUPPORT. 


FPOhfT  ACV^PTEP. 


e 


^ 


/XOAPTEf?  CHECir«.ATC.         AO>»PTER  CLAMP  VVCO^e. 


CLAMP  t^CMC  eo^VN. 


STORvAGC  CHEST  "c!* 

0BTUR>rrD9~3PINDL£  PUtTC. 


OkAMPIMG  WRCNCH. 


scctfRiN«  aoffov. 


SECUKTiNC    «Cf7K>V  »V^KNCH' 


FRONT  AOAFTCR. 
lO-IN.  1689  ^1890. 


r|?ONT    ADAPTER. 
d-IN.  1809. 


PRIMER  PLAME  B/tFFLE. 


36-/i-  t« 


PL/ITEIV. 


/ID/4PTEf?S^  STOP/IGE  GPEST  'V''MD  TOOLS 

FOR  /O  /t//D  /e-ZM  GUA/S,  MODEL   OF  /900. 


4^ 

STOP  PtATC. 


/IDAPTCR  CLAMP  HTCOOC- 


REAR   AOAPTen. 


FRONT  ADAPTER. 


RCAl?  ADA  PTCR  SHOr. 


AOAPTCR  CHECK  fl.Ant. 


pRiMcir  FLAMc  eAPrte. 


OBTURATOR  «PIMOkC  PLATE . 


OCAMPlN€  MrpcNCK 


SEOURIN«  SCREW. 


^ 


BECURINO  ^GRCyy  WRCMCH. 


5^-^6  -a.^ 


"s 


FL/1TE  1/: 


ADAPTERS,  8T0/?AG£  CHEST  "G"/JA/D  TOOLS 

FOP  5-/N.  GUNS.  MOD£LS  OF  /897  <£.  /900, 
AND   6-/N.  eUNS,  /ILL  MODELS. 


EXR4NOINO  scf?ew. 


®) 


MUZZLE  euppotn- 

SET  SCRCW. 


fRONT AOAPTER.         MUZZLE  SUPPORT. 


REAR  ADAtn-eR 
lVCOO£. 
WEOCE.  SCREW        FOR  6"flUN6. 
FOR  6"  GUNS. 


RCAlf  ADAPTER. 


REAR  AOAPTER 

Shoe.' 


rRom 

CENTCf?  ADA  PTCR . 

SUPPORT. 


/ADAPTER  SHOE  AOi^PTCI?  SHOE. 

ADAPTER  SHOE  KVEDtfE.  ff-fQCO. 

IVEOe^  screw; 


(YEOtfC 
S-1900. 


Rt4ll  ADAPTK.R. 
3'''1900. 


STORAGE.    CHCST  "C? 


SECVRtNC  SCREW, 


OBTURATOR 
SPINDI-E  PLATE. 


DISMOUNTING  PIN. 


cr 


PfflMCfT  FLAME  BylFPLC. 


CLAMPiNG  SCREW  DRIVER. 


PMTEW. 


/1D/IPT£/?S,  STOP/JGEO/ZEST  'C'MD  TOOLS 

FOP  ^-/M  D^/eSS'SO^^O£D£/?,  ^.72  /lA/D  ff-ZM 
AiPA4ST/^ONG  Gi/A/S. 


EXBANOtNC  8Crvei¥. 
CENTER  SUPPOfTT.  hAVTZLfL    Sl/PPOfiT. 


STORAGC   CHEST  "C. 


DtSMOUNTTIMO  PIH. 


rr 


=--UJL-^ 


CLAMPING    SCREW  DmVe.19. 


ja.aS /N.  SUBCAL/BER  GUA/. 

ADAPTSO    TO   /Z /fif.  MORTAfiS,    MOOSLS  Of=    fSOe, 

/ae6-'90Mt,  /aso,   /eaoMi,  /90s  /i/vo/9/2. 


C 


GUN. 


REAR  ADAtnEH.  FROWT  ADAPTER. 


THREAD  CLAMP 
SCREW. 
ADAPTER 
CLAMP    WEOQkt. 


CLAMP  W£OaE 
SCREW. 


LOCATING  GAUGC. 

CLEMMING    SPONGE., 


SPONGE    ROD. 


3Dr 


GUN    EXTRACTOR. 


IPIKE 


HANDSPIKE    HEAD. 


ADJUSTING     WRBNCH, 


3 


1) 


CLAMPING     WRENCH. 


HAND    EXTRACTOR 


(®  °  q) 


W'ENT    CLEANKR. 


3^ 


eSr/zicTOR.    3°«;;^5>«r,»«£.       -    «,«c«chV  '     »5Si;5!«c 


5 ETC (/R I WC  5 CREW         ~  OILCAN. 

SGREV\/. 


36-y6-zz 


OR/LL  PR/MER. 


£r/VD  CLOS/NG  CUP 


EM^  I: 


i^^m^-/mmk 


2Z 


m^2<i^^ 


BODY 

FRICTION   PELLET 


W. 


S£/FRAT£0    W/RE 


BUTTON. 


BUlTTOAf  W/R£ 


I   ^   '   '    ■    I    '    I    I    '    I 


PLATE  I 


REV.   APRJ0,I914.  36'23-S^ 


ZZOJ 


o 


f  Gaylord  Broft. 

i:      ^  Makers 

i  Syraauae.  N     Y. 

'  PUT.  W.  21.  '« 


TL  64J^4 


